Tom Felton, who played Draco Malfoy in the Harry Potter film series, and Henry Winkler, best known as Fonzie on Happy Days and as the producer of MacGyver, have joined the guest line-up for Wizard World St. Louis, March 22-24, 2013, at America's Center in St. Louis, Missouri.

They join a roster that includes Stan Lee, Laurie Holden, Billy Dee Williams, James Marsters and Dean Cain among others. Winkler will appear all three days of the show while Felton is scheduled for Saturday and Sunday only.

The show is scheduled to run from 3 to 8 PM on Friday, March 22, 10 AM to 7 PM on Saturday, March 23, and 10 AM to 5 PM on Sunday, March 24.

For more information, including comic book creators and other guests scheduled to attend, visit the show’s site.